Last Month’s SummerSlam reportedly did not have any smart money betting odds. Backstage reports indicate that there was at least one “insider” who knew the finishes to all the matches and made a significant amount of money. 
This unidentified person placed an amount of $3.36 per match for ten matches, which he all got the winners correct, so he ended up winning $45,600. The reason this worked out for him is that gambling sites didn’t adjust the lines (due to the lack of smart money) and none of the finishes were changed at the last minute by Vince McMahon.
Source: Wrestling Observer Newsletter